Esterification in a PFR with Aspen Plus V8.0
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1 Esterification in a PFR with Aspen Plus V Lesson Objectives Use Aspen Plus to determine whether a given reaction is technically feasible using a plug flow reactor. 2. Prerequisites Aspen Plus V8.0 Basic knowledge of reaction rate laws 3. Background Consider the reversible liquid phase esterification of acetic acid shown below. The examples presented are solely intended to illustrate specific concepts and principles. They may not reflect an industrial application or real situation. 4. Problem Statement and Aspen Plus Solution It is desired to produce 9,000 kg/day of ethyl acetate product from a feed stream consisting of 13 mole % acetic acid, 35 mole % ethanol, and 52 mole % water. This feed stream is available at 100,000 kg/day. A single tube plug flow reactor with a length of 10 meters and a diameter of 1 m is available for use in an existing chemical plant. Determine if it is feasible to achieve the desired product using this reactor. 1
2 Aspen Plus Solution: Start Aspen Plus V8.0. Select New Chemical Processes Chemicals with Metric Units. Click Create Define components. In the navigation pane go to the Components Specifications Selection tab and click Find. Search for and select acetic-acid, ethanol, ethyl-acetate, and water. If a window appears asking to update the parameters, click Yes Populate the binary interaction parameters by going to Methods Parameters Binary Interaction NRTL-1. 2
3 4.04. Create the flowsheet. Enter the simulation environment by clicking the Simulation button in the bottom left of the screen Place an RPlug block onto the flowsheet from the Reactors tab in the Model Palette. The RPlug block models a plug flow reactor with no axial mixing using the user specified stoichiometry and kinetics. Connect the required ports with material streams Define reactions. In the navigation pane go to Reactions and select New. A default reaction ID R-1 will be created, select GENERAL for type. 3
4 4.07. In the R-1 Configuration tab click New. For reversible reactions it is often useful to enter the forward and reverse reactions as separate reactions within the same reaction group. Start with the forward reaction. Name the reaction, select reactants and products, and enter the stoichiometric coefficients Click on the Kinetic tab and enter k = 8e-06 and E = 0. Click on Driving Force and enter 1 for the reactant concentration exponents. 4
5 4.09. For the reverse reaction, go back to the Configuration tab and click New. Name the reaction, select reactants and products, and enter the stoichiometric coefficient. 5
6 4.10. Click on the Kinetics tab and select reaction 2. Enter k = 2.7e-06, E = 0. Click on Driving Force and enter 1 for the reactant concentration exponents. 6
7 4.11. Specify reactor operating conditions. Go to Blocks RPLUG Setup. Select Reactor with specified temperature, and choose Constant at specified reactor temperature, in this case 100 C Specify the geometry of the reactor in the Configuration tab. Enter Length = 10 meters and Diameter = 1 meter. Leave the options for multitude reactor unchecked since we want to model a single tube plug flow reactor. Select Liquid-Only for Valid phases In the Reactions tab, move reaction set R-1 to the Selected reaction sets column. 7
8 4.14. Specify Feed stream. Go to Streams FEED Input. Choose Mole-Frac for Composition type and enter Acetic Acid = 0.13, Ethanol = 0.35, Ethyl Acetate = 0, and water = Enter Temperature = 100 C and Pressure = 1 bar. Select Mass as the Total flow basis and enter 100,000 kg/day Open the Control Panel and run the simulation (F5). The simulation should complete with no warnings or errors. 8
9 4.16. Check results. Go to Streams PRODUCT Stream Results (Custom). In custom stream results you can create data sheets that display only the results that you choose. A default sheet will appear with various stream results. Note that you can change the units and add new streams to the data table. To create a new data table, right click on the Default tab. Select Add New A dialogue box will appear, asking you to enter the name of the new data sheet. Once you name the new sheet, a new table will appear. You can customize which results you want to display by right clicking on the table tab and selecting Edit View. 9
10 4.18. Selecting Edit View will open up a wizard which will allow you to choose which streams you would like to display results for and which stream properties to display. In the Stream Selection tab, select both FEED and PRODUCT streams. In the Property Selection tab, begin by moving all properties to the left column, then move the properties you would like to see displayed over to the right column. For this case, select Component Mass Flow, Component Mole Flow, and Component Mole Fraction. 10
11 4.19. In the Display Options tab of the wizard you can edit the units for each property. Select kg/day for mass flow, and kmol/hr for mole flow The stream results should now look like the following. 11
12 This table shows that the flowrate of ethyl acetate is over 9,000 kg/day. Therefore this reactor is capable of meeting the desired production rate. 5. Conclusion The use of the 10 m reactor and provided feed stock to produce 9,000 kg/day is feasible. Aspen Plus can be used to model existing equipment in addition to designing new equipment. Modeling existing equipment lets engineers decide if they can repurpose equipment and improve performance by changing state variables. 6. Copyright Copyright 2012 by Aspen Technology, Inc. ( AspenTech ). All rights reserved. This work may not be reproduced or distributed in any form or by any means without the prior written consent of AspenTech. ASPENTECH MAKES NO WARRANTY OR REPRESENTATION, EITHER EXPRESSED OR IMPLIED, WITH RESPECT TO THIS WORK and assumes no liability for any errors or omissions. In no event will AspenTech be liable to you for damages, including any loss of profits, lost savings, or other incidental or consequential 12
13 damages arising out of the use of the information contained in, or the digital files supplied with or for use with, this work. This work and its contents are provided for educational purposes only. AspenTech, aspenone, and the Aspen leaf logo, are trademarks of Aspen Technology, Inc.. Brands and product names mentioned in this documentation are trademarks or service marks of their respective companies. 13
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